Fixing ArrayIndexOutOfBoundsException.

Fixes the following crash.

```
AndroidRuntime  E  FATAL EXCEPTION: main
                        E  java.lang.ArrayIndexOutOfBoundsException: length=12; index=-1
                        E      at java.util.ArrayList.remove(ArrayList.java:401)
                        E      at android.support.transition.utils.ViewOverlayCompat.removeView(ViewOverlayCompat.java:59)
                        E      at android.support.transition.utils.OverlayCompatibilityHelper.removeViewOverlay(OverlayCompatibilityHelper.java:44)
                        E      at android.support.transition.Fade$3.onAnimationEnd(Fade.java:337)
                        E      at android.animation.ValueAnimator.endAnimation(ValueAnimator.java:1018)
                        E      at android.animation.ValueAnimator.access$400(ValueAnimator.java:51)
                        E      at android.animation.ValueAnimator$AnimationHandler.doAnimationFrame(ValueAnimator.java:623)
                        E      at android.animation.ValueAnimator$AnimationHandler.run(ValueAnimator.java:639)
                        E      at android.view.Choreographer$CallbackRecord.run(Choreographer.java:725)
                        E      at android.view.Choreographer.doCallbacks(Choreographer.java:555)
                        E      at android.view.Choreographer.doFrame(Choreographer.java:524)
                        E      at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:711)
                        E      at android.os.Handler.handleCallback(Handler.java:615)
                        E      at android.os.Handler.dispatchMessage(Handler.java:92)
                        E      at android.os.Looper.loop(Looper.java:137)
                        E      at android.app.ActivityThread.main(ActivityThread.java:4745)
                        E      at java.lang.reflect.Method.invokeNative(Native Method)
                        E      at java.lang.reflect.Method.invoke(Method.java:511)
                        E      at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786)
                        E      at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
                        E      at dalvik.system.NativeStart.main(Native Method)
```